Hydrostatic axial piston machine

Abstract

A hydrostatic axial piston machine includes a pot-like housing, a connection plate that closes the pot-like housing, a rotatably mounted cylinder drum, and pistons arranged in cylinder chambers of the cylinder drum. The cylinder chambers are each alternately connected via a cylinder chamber opening to a low-pressure control opening and a high-pressure control opening of a resting control part. The control part has two switching regions located between the low-pressure and high pressure control openings. A piston reverses its movement direction in a dead center within the two switching regions. In the switching region, the cylinder chambers are connected via a connecting line to a fluid volume arranged in the housing. The fluid volume extends between the connection plate and the housing such that it is sealed to an interior by the connection plate and the housing.

What is claimed is: 
     
       1. A hydrostatic axial piston machine, comprising:
 a pot-like housing that has a housing base and a housing jacket, the housing jacket defining an open side of the pot-like housing; 
 a connection plate that closes the pot-like housing at the open side; 
 a rotatably mounted cylinder drum that is located in an interior formed by the housing and the connection plate, the cylinder drum having a plurality of cylinder chambers; and 
 a plurality of pistons arranged respectively in the cylinder chambers of the cylinder drum, the pistons configured to execute a stroke movement during operation, 
 wherein each cylinder chamber is configured to be alternately connected via a cylinder chamber opening to a low-pressure control opening and a high-pressure control opening of a resting control part at which two switching regions, within which a respective piston reverses its movement direction in a dead center, are located between the low-pressure control opening and the high-pressure control opening, and 
 wherein, in the switching region, the cylinder chambers are configured to be connected via a connecting line to a fluid volume located in the interior, the fluid volume extending between the connection plate and the housing such that the fluid volume is sealed to the interior by the connection plate and the housing. 
 
     
     
       2. The hydrostatic axial piston machine as claimed in  claim 1 , wherein the fluid volume is formed substantially by a separate elongated hollow body which extends between the connection plate and the housing and which is sealed to the interior by the connection plate at one end and by the housing at the other end. 
     
     
       3. The hydrostatic axial piston machine as claimed in  claim 2 , wherein the separate elongated hollow body has a cylindrical shape. 
     
     
       4. The hydrostatic axial piston machine as claimed in  claim 3 , wherein the separate elongated hollow body has a circular-cylindrical shape. 
     
     
       5. The hydrostatic axial piston machine as claimed in  claim 3 , wherein the separate elongated hollow body has a kidney-shaped cross section adapted to the cylinder drum. 
     
     
       6. The hydrostatic axial piston machine as claimed in  claim 2 , wherein the housing and the connection plate each have a depression, and wherein the separate elongated hollow body dips into the depressions. 
     
     
       7. The hydrostatic axial piston machine as claimed in  claim 6 , wherein a seal is arranged in each depression between the separate elongated hollow body. 
     
     
       8. The hydrostatic axial piston machine as claimed in  claim 2 , wherein the separate elongated hollow body is seamlessly drawn. 
     
     
       9. The hydrostatic axial piston machine as claimed in  claim 6 , wherein the separate elongated hollow body has, at least at one end, a connecting piece which differs in terms of its outer shape from the outer shape between the two ends and which dips into a depression. 
     
     
       10. The hydrostatic axial piston machine as claimed in  claim 2 , wherein the separate elongated hollow body extends from the connection plate to the housing base of the housing. 
     
     
       11. The hydrostatic axial piston machine as claimed in  claim 2 , wherein the separate elongated hollow body extends to a bearing which protrudes from the housing jacket at a spacing from the housing base. 
     
     
       12. The hydrostatic axial piston machine as claimed in  claim 1 , wherein the fluid volume is formed directly in the material of the housing and reaches to the connection plate. 
     
     
       13. The hydrostatic axial piston machine as claimed in  claim 1 , wherein the connection plate has a substantially planar inner face delimiting the interior.